Re: Newbie Question
I'm FAIRLY new here too, but I can tell you ppl do trade stuff on here.
Also, not sure what you beleive is the problem, but if it is NOT in the prop shaft, the lower unit is fairly easy to work on and parts are plentiful.
My first reccomendation would be to get a Mercury (official) shop manual so you can identify what is missing. That will give you the part #'s you need, and you can fix it yourself if you are at all mechanically inclined.
If that doesn't appeal to you. IDK where you are, but there are ppl out there that swap for them as cores and give you a rebuilt one. There is at least one company that does it over the internet, but shipping will be pretty high.
Best I could do with what info you provided.
Best of luck to you!